Variable-sized data fields, BK1120.
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EtherCAT master TODO
$Id$
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Important things to do:
* New SDO-Configuration interface
* Remove slave type information from master / New RT Interface
* SysFS interface for Secondary slave address
* Implement all EtherCAT commands
* Determine number of frames the NIC can handle
* Implement eepro100 driver
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Not-so-important things to do:
* User space tool for configuration
* Calculate bus topology
* File access over EtherCAT (FoE)
* Allow VLAN tagging
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